Multiple accumulator calculating machine



g- 1932. N. w. PERKINS MULTIPLE ACCUIULATOR CALCULATING MACHINE Filed April 17, 1930 14 Sheets-$heet 1 3 1932- N. w. PERKINS 1,374,709

MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17. 1930 14 Sheets-Sheet 2 3n um M01,

dam nu.

Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17, 1930 14 Sheets-Sheet g- 30, 1932- N. w. PERKINS 1,874,709

MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17, 1930 14 Sheets-Sheet 4 Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING IACHINE Filed April 17, 1930 14 sheets-Sheet 5 wmwm Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17, 1930 14 Sheets-Sheet 6 Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17. 1930 14 Sheets-Sheet 3N Wm NN Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17, 1930 14 Sheets-Sheet 8 INVENTOR ATTORNEY Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUIULATOR CALCULATING MACHINE Filed April 17, 1930 14 Sheets-Sheet 9 HH. I

ATTORNEY Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17, 1950 14 Sheets-Sheet 10 Aug. 30, 1932. I w, PERKlNs 1,874,709

MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 17, 19150 14 Sheefs-Sheet ll Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING MACHINE Filed April 1'7, 1950 14 Sheets-Sheet 12 gum-nib! dl'tozun Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUMULATOR CALCULATING IACHINE 1930 14 Sheets-Sheet 13 Filed April 17 Ell duo! at Aug. 30, 1932. N. w. PERKINS MULTIPLE ACCUIULATOR CALCULATING IAGHINE Filed April 17, 1930 14 Sheets-Sheet l4 gwozntoac Patented Aug. 30, 1.932

TUNITED STATES PATENT OFFICE NATHAN W. PERKINS, OF EAST ORANGE, NEW JERSEY, ASSIGNOR T ELLIS'ADDING TYPEWRITER COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY Application filed April 17,

The Ellis adding machine, or adding or subtracting machine, as disclosed in patents to Halcolm Ellis, Nos. 1,197,276; 1,197,277; 1,197,278 dated September 5, 1916; No.

61,203,863 dated November 7, 1916; Bernau,

No. 1,508,267 dated September 9, 1924; and

- No. 1,731,701 dated October 15, 1929, employs only two accumulators, together with mechanism whereby either or both of the accumulators may be utilized or cut out under the control of adding or subtracting keys, a non-add key, or, under control of the travelling carriage when the latter is in predetermined tabulated positions.

1 In an application of Emil J. Ens, Serial No. 323,124, filed December 1, 1928, for quadruplex accumulator calculating machines, disclosure is given, and claim is madeto, two adding accumulators which are additional to the two accumulators disclosed in the foregoing-Ellis and Bernau patents, to-

gether with improved controlling and selecting mechanism. The Ens machine provides four accumulators wherein addition may be performed in any one of the adding accumulators, addition or subtraction performed in the combined adding and subtracting accumulatonaddition simultaneously performed in selected ones of the adding accumulators, and amounts transferred from one accumulator to another. However, in the Ens machine of Serial No. 323,124, all additive op erations are solely controlled by the tabulated position of the carriage as all adding keys on the keyboard are dispensed with.

In the Ens machine, subtracting and non-add functions are obtained by using subtraction and non-add keys, a total is taken from any accumulator by the use of a total-key therefor, and a sub-total is taken from any selected accumulator by the conjoint use of a single sub-total key and the total-key of the selected accumulator.

The present invention has for one of its objects to greatly increase the capacity of the Ellis machine, which is accomplished by the provision of means enabling several adding accumulators to be used in addition to the usual two accumulators disclosed in the foregoing patents and increasing, by several 1930. Serial No. 445,051,

understood that one or both of the two main accumulators may be straight adding accumulators and that the necessary changes may be made in the keyboard controlling mecha- IllSIIl.

Another object is to provide a multiple accumulator calculating machine wherein the I control of any accumulator, either for addi 7 tive or subtractive operation may be had either from the controlling keys of the keyboard, or, from the carriage, according to the tabulated position of the carriage, subject to the taking of a sub-total or a total from any given accumulator under the control of total and sub-total controlling keys on the keyboard.

A further object is to provide a multiple accumulator calculating machine having adding accumulators and one or more combinedi adding and subtracting accumulators, and] improved means whereby addition may be performed in one or more of the adding accumulators while simultaneously adding into, 8. or subtracting out of, one or more combined adding and subtracting accumulators, at a given operation of the machine.

Another object is to provide in a. multiple accumulator calculating machine improved means whereby totals or sub-totals may be transferred from any given accumulator to one or more of the other accumulators on a single operation of the machine.

The one or two combined adding and sub tracting accumulators usually provided on the Ellis machine may be of the construction and operation set forth in the patent to Perkins and Ens, No. 1,679,265, July 31,1928, such construction being disclosed herein, but 10 it will be understood that other combined adding and subtracting accumulators may be used in lieu thereof as the main accumulators.

A further object is to provide an improved construction of adding accumulator for use in the group of auxiliary accumulators employed in the present improved machine.

An additional object is to provide, in a multiple accumulator calculating machine, a group of accumulators subject to both key and carriage control through improved means common to controlling keys and a carriage whereby either key or carriage control may be had without interference at any given time.

For a further object, the invention seeks to provide, in a multiple accumulator calculating machine, improved selective means under carriage control by which one or more of the accumulators may be arranged for operation. I

Another object is the provision of a multiple accumulator calculating machine having an improved combination of main gears, operable by the key-controlled actuators or racks of the machine, and a plurality of independent accumulators, and controlling means for said accumulators, either key-operated, or carriage-operated, or both key-operated and carriage-operated, adapted for selective engagement with the main gears by improved means so that the amounts transferred to the gears by the actuators or racks may be entered in one or more of the said accumulators, or the amount standing on any accumulator or any number of accumulators may be obtained.

The invention has for a still further object the provision of a self-contained, unitary multiple accumulator which may be bodily attached to an Ellis machine, or to any other calculating machine of the same general class having racks, gears, or sectors adapted to shift distances corresponding to digits set up on a keyboard, to the end that the group i or multiple accumulators may be individually or collectively used in connection with the regular accumulators and mechanisms of the Ellis, or other, machine for the accumulation and transfer of amounts.

Provision is made for the control of the accumulators by a controlling keyboard which comprises three rows of keys. The right hand row, that nearest the usual numeral keyboard of the machine, comprises 'the usual error and repeat key for use in connection with the numeral keyboard, and the controlling keys for the combined adding and subtracting accumulators such as for the performance of addition, subtraction, non-add, and the taking of totals and sub-totals. The middle row of controlling keys comprises keys representing totals for all of the group of adding accumulators embraced in the present invention and also a sub-total key therefor. The left hand row of controlling keys" comprises. keys for controlling'the adding function of allof the .straight adding acing accumulators of the multiple group or series; improved driving and controlling connections; starting bar interlocking means; interlocks between the total keys, preventing more than one being depressed at a given time; interlocks between the total keys and the starting bar, and other constructions and details appearing more fully hereinafter.

In the accompanying drawings and the following specification, only so much of the Ellis calculating machine is shown as will afford a clear understandlg of the constructlon, operation, functions, and combination of the present improvements therewith, it being understood that the driving mechanism, numeral keyboard, tabulating and printing mechanisms, carriage and carriage-control, racks, reducers, etc., disclosed in the Ellis, Bernau, Ens and Perkins patents and applications hereinbefore referred to, may be embodied in the machine.

In the accompanying drawings:

Figures 1 and 1 comprise an elevation of the left or controlling side of the machine, the

case being in section, showing the two left hand rows of controlling keys and parts for the group of adding accumulators;

- Figs. 2 and 2*- comprise a longitudinal section on the line 22 of Figs. 3, 3*, showing the remaining construction at the left side of the machine, including the row of controlling keys for the accumulators usually employed in the Ellis machine and showing the group of adding accumulators;

Figs. 3 and 3* comprisea plan view of the mechanism at the controlling or left side of 'the machine, dotted lines representing the three rows of controlling keys, the case being in section;

Fig. 4 is a front elevation of the controlling keyboard, the base of the machine being in section and the deck broken away;

Fig. 4 is a rear elevation of the controlling keyboard;

Fig. 5 is a plan view of the controlling keyboard, illustrating one set of designations which may be used on the key buttons;

Figs. 6 and 6 comprise a longitudinal section through the rear of the machine, show-ing the usual accumulators of the Ellis machine in Fig. 6 and certain ones of the straight adding accumulators of the multiple group in Fi 6' Figs 7 and 7 comprise a rear elevation of the complete machine illustrating only one accumulator;

Fig. 8 is a detail vertical section on the line 88, Fig. 11 of one of the improved accumulators when in normal position;

Fig. 9 is a similar sectional view showing the accumulator in mesh with the large gear as in an adding operation;

Fig. 10 is a view like Fig. 8, showing the position of the parts just before the restoring bar starts to restore the sector actuator;

Fig. 11 is a fragmentary side view of the accumulator shown in Fig. 8;

Fig. 12 is a detail side view of one of the accumulator detents when in normal position;

Fig. 13 is a similar view showing the detent midway its travel;

Fig. 14 is a front view of the detent, the springs being omitted;

Fig. 15 is a detail side elevation of the adding keys and the release key and their connect-ions which control the accumulators for addition;

Fig. 16 is a similar view of the total keys and the sub-total key and their connections to the accumulators whereby the accumulators may be controlled for totalizing;

Fig. 17 is a detail view of the link and lever for operating the total cam;

Fig. 18 is a plan View of the sub-total key and a part of the means for releasing the total keys on a sub-total operation;

Fig. 19 is a side elevation thereof;

Fig. 20 is a plan view of the mechanism for oscillating the shaft which controls the restoring bars for the auxiliary accumulators; and

Fig. 21 is a side elevation thereof.

The rear of the travelling carriage of the Ellis machine appears in Fig. 7 and the left hand end thereof in Fig. 1 but disclosure is not given of the rack at the front of the car riage which carries adjustably mounted stops for cooperation with the carriage controlled levers FF61. 4F64, 4F62, 4F61 and 4F63 appearing in Figs. 2 and 3. Reference is to he had to Ellis Patents Nos. 1,197,276 and 1,197,"- 278, September 5, 1916, for a full disclosure of the manner in which the carriage and its-stops at the front thereof, control the accumulators.

The carriage control of the adding accumulators of the group which have been combined with the Ellis machine according to the present invention and which accumulators appear in Figs. 1 and 3, constitutes entirely independent carriage controlling means from the controlling means on the carriage for the levers FF61, 4F64, 4F62, 4F61, 4F63, as will hereinafter appear.

The control of the regular adding and subtracting accumulators used in the Ellis machine, such accumulators appearing at the left of Fig. 2 and in Fig. 6, may be accomplished through the keyboard of Fig. 5, independently of the control of the group of straight adding accumulators appearing in Fig. 1

through keys of the keyboard shown in Fig.

5, and reference is to be had to Figs. 3 and 3 for the general lay-out of the said controls.

The group of straight adding accumulators seen in Fig. 1, and the carriage and key controls therefor, may be built into the machine originally, or, added to an existing Ellis machine.

The base of the Ellis machine appears at B; the shell or case is shown at B48.

Only so much of the front of the carriage C 15 is shown in Fig. 1 as will afford a general disclosure thereof, the platen appearing at S92, the paper table at S150. and a part of the carriage frame at S52. The part 92C is supported by ball bearings 910. As previously explained, the equipment at the front of the carriage is omitted and reference is to be had to prior patents enumerated, for the control of the lovers FF61, 4F64, etc.

The improvements carried by the rear of the carriage C45 will be later described when reference is made to the automatic control, by the carriage, of the group of straight adding accumulators.

Adding and subtracting accumulators.- The construction and operation of the adding and subtracting accumulators seen at the left of Fig. 2 and in Fig. 6*, are of the Ellis type and reference is to be had to the patents enumerated, the particular construction illustrated being substantially that disclosed in the patent to Perkins and Ens, No. 1,679,265, July 31, 1928, to which reference may be had for a disclosure of details. The accumulator gears 01' wheels are shown at N50, the doublepointed carrying cams appear at N56, adding and subtracting hooks are shown at 61N. 62N,

N61 and N62 as carried by the shaft N103.

The single cam plates N257 and 257N which are pivoted at N7, cooperate with the pins 311N carried by the toothed detents N52 and 52N. The pins 311N are connected by springs to the bail 73N.

The shift bars appear at N90 and 90N for the upper and lower accumulators. Other elements entering into the construction of these adding and substracting accumulators constituting the regular Ellis machine equip ment, may be ascertained from the Perkins and Ens Patent No. 1,679,265.

In Fig. 6", disclosure is given of one of the usual adding racks or actuators R with which the wheels or gears N50 are adapted to cooperate in the usual Ellis construction.

The lower crank N65 carries a pin 17 7, Fig. 2, with which the lower subtracting operating latch N168 is adapted to latch or engage.

The subtracting detent levers N169 and tops the bar 267.-

' cumulators is supported from the main frame by carrying plates 102, 103, attached to the side frames N45, 45N, which mount the adding and subtracting accumulators previously described. These plates 102, 103 are braced against the base B45. I

A slotted plate 104, carried by bar 101, serves as a guide 'for the supplemental racks 100, there being one of these supplemental racks 100 attached to each of the usual racks B50 in any suitable manner, as by studs, rivets or screws for the purpose of making the supplemental racks unitary with the racks R50 and to constitute racks 100 as rearward extensions of racks R50 so that movement will be imparted' to each rack 100 exactly as though it were integral with't-he rack R50 to which it is connectcd,-thusenabling all movements of racks R50 to be utilized in connection with the improved multiple accumulator construction hereinafter described.

Two plates 108, Figs. 2, 6, 7, are fastened by screws 109 and posts 110 to the plates 102 and 103. Two rods 113 secured to the right hand plate 108, and a rod 114, pass through these plates and are extended at the left and have secured thereto the plates 115 and 116, Figs. 1?, 3, 6. The plate 115 is also carried by posts 117 in the'side frames N45 and 45N of the adding and subtracting accumulators. Plates 102 and 103 carry at their The plates 108 have mountings 111 and 112 for ashaft 106. Carried by the shaft 106 are the large gears 105, Figs. 6,- 7, corresponding in number to the auxiliary or extension racks 100, said large gears constantly meshing with the respective extension racks so that every movement of a given rack or actuator is communicated to the corresponding gear 105. The rods 113 and 114 pass through the spaces between the spokes of the gears 105, permitting turning of each gear a distance sufiicient to permit proper actuation of the respective auxiliary adding accumulators of which two appear in Fig. 6 and whose construction is disclosed in Figs. 8, 9, 10, 1'1.

Auxiliary adding a0cumuZat0rs.Referring to Figs. 1 6, illustration is given, by way of example, of eight auxiliary adding accumulators, additional to the adding and subtracting accumulators appearing in Figs. 2 and 6' but it will be understood that a greater or lesser'number of the auxiliary accumulators maybe used, according tothe work the machine is intended to carry on and the particular use to whichit is put. Similarly, while combined adding and subtractmg accumulators are shown in Figs. 2 and- 6, one of these regular Ellis type accumulators may be an adding and subtracting ac cumulator and the other a straight adding accumulator, or, if the machine is to be used where subtracting operations are not necessary, both of these accumulators may be straight adding accumulators.

The auxiliary accumulators, however, are preferably straight adding accumulators.

Referring to Figs. 2, 6, 7, 8,9, 10 low channelpieces 118 are fastened by screws 119 to the plates 108, these channel pieces ex- 11, shaltending across the group of large gears 105.

Fastened to the channel pieces 118 are brackets 120 through whose ends extend rods 121 which are attached to the plates 108. Carried by the brackets 120 are rods 122 and 123.

Sectors or detents 124 are rockably mountedon the rod 122. Sector actuators 125, connected by springs 126 to the sectors or detents 124, are also rockably mounted on the rod 122. through which projects the pin 127 carried by the sector 124.

Rockably mounted upon the rod 123 are latches 128 which, when latched, hold or look the sector actuators 125 in normal position against the action of springs 129 cooperating therewith.

Each sector actuator 125 has a notch Referring to Figs. 2, 6, 7, 11, there are shal-.

low channel strips 130 carried by intermediate brackets 131 and end brackets 132 forming a rigid structure carrying rods 133 and 134. The brackets 132 at one end of the structure are forked over the rod 122 and at the other end thereof are provided with pins 140 (Fig. 11) which are guided in radial slots in the plates 108. I

Accumulator gears 135 are mounted on rod 133 and carry double-pointed trip cams 136 which are fastened thereto by rivets 137 so that the gears and trips are unitary. Trip 8 and 9.

The other ends of the trip pawls 138 are provided with forks which receive a pin 139 carried by the latch 128 onthe next higher order of accumulator wheel .135, the purpose being to release the sector actuator of the next higher order of the accumulator when one of th points of the trip cam 136 pushes back and passes the trip pawl 138 of a lower order, thereby effecting carrying.

Suitable hubs and collars are provided to space the previously described parts.

The springs 1.29 connect the sector actuators 125 to the trip pawls 138, thus actuating both of said pieces.

Controlling connections for the auxiliary (wemnu7at0rs.Referring to Figs. 2, 6, 8, 9, 10, 11, there are lugs 132" and pins 141 which .project laterally and outwardly from the rackets 132. Between the lugs and the pins are the ends of two short levers 142, said levers being mounted on the shafts 143 for the respective accumulators, said shafts 143' passing through the brackets 120, Figs. 3", 7, 8, 9, 10, 11.

Fastened to the central shaft 106 are two restoring plates 145, Figs. 2, 6, 7 to which restoring bars 144 for the respective auxiliary accumulators are fastened so that when said restoring plates turn, the restoring bars 144 for all of the accumulators will be shifted. As previously explained, any or all of the accumulator gears 135 are adapted to be made to mesh with the large or main gear 105 or with their respective carrying sectors 124.

The right hand end sectors 124 are fastened to the right hand end brackets 120 to prevent these particular sectors from turning. The restoring plates 145 have slots 145, Fig. 6, to permit the free passage of rods 113 so that there will be no interference therewith.

Referring to Figs. 1, 3*, 7, the shafts 143 have bearings 146 which are held by screws in the slots 115 in the plate 115. The left hand ends of shafts 143 have cranks 147 to carry pivoted pawls 148 provided with slots at their ends.

There are two spaced incomplete or partial discs 150, 152 which are carried by shaft 106 and are respectively provided with pins 149 and 151. hen a latch pawl 148 is moved in one direction, its slot will latch over pin 149 and when moved in the opposite direction, its remaining slot will latch over pin 151. The two upper front latching pawls 148 are made double, Figs. 1, 3, the two parts being connected, and the space between these pawls permitting the passage of one of the wire links 158.

The latch pawls 148, 148 are independently operated by the following means. For each pawl 148, there is a lever 154, some of which are pivotally mounted on plate 115 and others on plate 116, Figs. 1 7. The respective levers 154 are connected by links 153 to the latches 148. Each lever 154 is held in a neutral position by a hairpin spring 155 having its coil encircling the pivot of the lever and its ends bearing against the opposite sides of the pins 156 carried by said levers and pins 157 on the plates 115 and 116. This arrangement prevents the latches 148 from normally enga 'ng either of the pins 149, 151. Sectional, a justable, turnbuckle wire links or connections 158 are pivoted at one end to the levers 154 and at their forward ends, they are pivotally connected to the upper ends of levers 159 carried by the controlling keyboard section of the machine, Figs. 1, 1, 4, 4".

The sectional, adjustable construction of links 158, enables any desired adjustment to be obtained to prevent normal engagement of the pawls 148 with pins 149, 151.

Driving connections for auxiliary accwmu Zat0rs.'lhe incomplete or partial discs 150, 152 are adapted to turn freely on'shaft 106 and each of these discs carries a cam roll 160, Figs. 1, 3, 7. A shaft 161 which is journalled in the plates 103 and 115, Figs. 1, 3, has secured thereto a cam 162 whose slot cooperates with the cam roll 160. The shaft 161 has fast thereon an arm 163, Figs. 1, 3, 12, 13, 14 which is connected by a link 164 to the upper end of a pivoted flying lever 165. A shaft 166 which is journalled in the plates 103 and 115, carries a cam 167 and an arm 168, Figs. 1, 3. There is a cam roll 160 carried by the other partial disc 152. The arm 168 isconnected by a link 169 to the upper end of another pivoted flying lever 170.

The cams 162 and 167, in conjunction with the respective rolls 160 on the partial discs 150 and 152, provide means whereby the said partial discs may be operated by the means shortly to be described.

Referring to Figs. 12, 13, 14, in connection with Figs. 1, 3 7, there is shown an improved accumulator detent for the arms 163, 168 which have been referred to, said accumulator detent being used in connection with said arms to hold the cams 162 and 167, and hence the partial discs 150, 152, in the position to which they have been shifted, until such position is changed.

Accumulator detent.Referring to Figs. 12, 13, 14, the construction illustrated, is substantially that disclosed in the application of Emil J. Ens, Serial No. 323,124, filed December 1, 1928. There are two slotted slides or plates 290, 291 which are drawn toward each other by contractile coil springs 293 whose ends are engaged with horns on said slides or plates. One of the slides or plates 290 is mounted on the rod 171 (in the other instance on the rod 172), the rod 171 being carried by the plates 103 and 115; and the rod 172 being carried by the plates 108 and 115. The remaining slide 291 is pivoted at 292 to the arm 163 in one instance and to the arm 168 in the other instance. The slots receive the connections 171, 292, as shown in Figs. 12, 13, 14 so that the respective plates slide in relation to each other against the contractile action of the springs 293 when the arm 163 is shifted. The springs hold the arm 163 in the two limits of its play, thereby holding the partial discs 150, 152 where set.

Driving means or auxiliary accumulat0rs.The means or operating the driving connections for the auxiliary accumulators is operated by the main shaft 01 of the machine, following the practicein the Ellis machine. A driving plate 173, Figs. 1 and 3, secured to shaft 01, carries flying levers 165 and 170 pivotally mounted thereon, said le- 6 vers being respectively pivoted to the driving links 164 and 169.

The flying lever 165 is adapted to contact with a square stud 174, said stud rigidly connecting the driving plate 173 .with the usual driving plate D50, Fig. 3, which is carried by shaft 01 and is a well-known feature of theEllis machine as shown by Ellis Patents Nos. 1,197,276; 1,197,278; 1,203,863, whereby plates 173 and D50 move as a unit. The square stud 174 by its engagement with the flying lever 165, insures the return of said lever to normal position.

There are two square pins 175 and 176, Figs. 1 and 3, carried by driving plate 173, which are adapted to contact with the flying lever 17 0 to effect the shifting of the link 169, the cam 167, Fig. 1 and the partial disc 152 during the last part of the stroke of the main shaft 01 in both directions. By reference to the preceding description, it will be seen how, on each stroke of the main shaft 01 when the machine is put through its cycle of operations, the link 169 operates the mechanisms appearing in Fig. 1' so that if the proper keys have been set or the carriage brought to the proper tabulated position, as will now be described, accumulation may be effected in one or more of the auxiliary accumulators,

but the link 164, cam 162 and partial disc F move only when taking a total.

Controlling keg/board.-Referring to Figs. 1, 2, 3, 4, 4*, 5, the row of keys to the right of Fig. 4', being in the row nearest to the numeral keyboard (not shown), contains the error key K61 and repeat key K62 for the numeral keyboard and also the controlling keys K63, K64, K65, K66, K67, K68, K69 for the adding and subtracting accumulators comprising the regular equipment of the Ellis machine except that both accumulators may be made to subtract, and which are shown at the left of Fig. 2 and also in Fig. 6".

The central or middle row of keys 228, etc. includes the sub-total key 228 and eight total keys for the eight auxiliary accumulators, or, as many total keys as there are auxiliary accumulators.

The left hand row of controlling keys 230, etc. includes the release key (230) and as many adding keys as there are auxiliary accumulators.

The latches and pins of the row of keys K61, K62, etc., are mounted on the left side frame 1347 of the machine; those of the middle row 228, etc. are carried by a plate 180,

Figs. 4, 4, and those for the left hand row v 230, etc. are mounted on a plate 181.

r The plates 180, 181 are attached to the base B45 by bars 182 which also space said plates; screws 183 fastening down the bars 182.

The plates 180, 181 are attached by bars 184, Figs. 1, 3, to the keyboard plate or deck 186 byscrews 185. The key stems are guided at the top by the plate 186 and at the bottom perforated angle pieces 187, Figs. 2, 4,

by stud K29. The push link 57K is a apted to shift the slide bar L51, seen at the right of Fig. 2. Reference may be had to Fig. 51 of Ellis Patent No. 1,197,276 forfurther details of this particular part of the Ellis machine.

The numeral error key K61 carries a piece 72K, appearing at the right of. Figs. 2, and 4, and at the upper right hand part of Fig. 3. The piece 72K in coniimction with the arm M52 carried by shaft 4, as seen in said figures, serves to interlock the starting bar (not shown) and the error key K61 to prevent both of them being depressed at the same time. Reference may be had to patent to Bernau, No. 1,731,701, Figs. 15, 16,17 for a complete showing of the interlocking of the gstarting bar by the shaft M4.

The repeat key K62, when depressed, is latched down by latch L155, Fig. 2, which effects the raising of the numeral key release hook L63 by means of the repeat key bar L61, Fig. 2, which action will be clearly understood by reference to Ellis Patent No. 1,197,276.

The total key K63 for the upper adding and subtracting accumulator appearing at the left of Fig. 2 and in Fig. 6 will, when depressed, enable its latch L56 to depress the total cam arm 58L by the engagement of the pin 22L therewith, said total cam arm 58L then depressin the subtracting cam lever 60L which carries the total pawls 61L to position these pawls in the path of the lower end of the flying lever D53, causing lever D53 to move the upper regular accumulator, seen at the left of Fig. -2 at the beginning of the stroke of shaft 01 in either direction, all of which will appear more fully on reference to the Ellis Patent No.- 1,197,276.

Inasmuch as the repeat key K62 has a bar L61, Fig. 2, carrying pin 25L extending under the total cam arm 58L, when said arm 58L is depressed, the repeat key bar is also depressed, which brings its rear end intothe path of travel of the roller 40D which, ordi- 

